由动力学核介导的相互作用标量场暗物质与早期暗能量的宇宙学约束
Cosmological Constraints on Interacting Scalar-Field Dark Matter and Early Dark Energy mediated by a Kinetic Kernel
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México（墨西哥国立自治大学物理科学研究所）
- Departamento de Física, DCI, Campus León, Universidad de Guanajuato（瓜纳华托大学莱昂校区DCI物理系）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
本文构建了约束相互作用标量场暗物质与早期暗能量的通用框架，以二次势暗物质和Albrecht-Skordis势暗能量为例，利用多种宇宙学数据约束参数，发现参数趋近ΛCDM极限，且无显著能量转移偏好。
中文摘要 AI 辅助
在这项工作中，我们构建了一个用宇宙学观测约束相互作用标量场的通用框架，适用于一大类标量场势能和相互作用核。作为一个代表性例子，我们推导了对一个模型的约束，在该模型中，暗物质由具有二次势能的标量场 $\phi$ 描述，暗能量由具有 Albrecht--Skordis 势能的标量场 $\psi$ 描述，同时考虑了非耦合情形和更一般的场景，即能量交换通过一个与标量场动能成正比的相互作用核 $Q \propto \dot{\phi}^2 \dot{\psi}^2$ 发生。标量场参数通过使用 \textit{Planck} 2018 CMB 数据、DESI BAO 测量、Ly-$\alpha$ 森林约束和 SNeIa 观测来约束，我们发现标量场参数被推向其 $\Lambda$CDM 类极限；早期暗能量分数在很大程度上被抑制，并且 SFDM 质量被限制在使得场行为接近冷暗物质的数值范围内。在相互作用情形中，结果显示在 95% 置信水平下，暗能量与暗物质之间的能量转移没有显著偏好。总体而言，该模型使 $H_0$ 保持在接近 Planck-$\Lambda$CDM 范围内，并提供与相应 $\Lambda$CDM 拟合相当的最佳拟合 $\chi^2$ 值。
英文摘要
In this work, we build a general framework for constraining interacting scalar fields with cosmological observations, applicable to a broad family of scalar--field potentials and interaction kernels. As a representative example, we derive constraints on a model in which dark matter is described by a scalar field $ϕ$ with a quadratic potential and dark energy by a scalar field $ψ$ with the Albrecht--Skordis potential, considering both the uncoupled case and a more general scenario in which the exchange of energy occurs through an interaction kernel proportional to the kinetic energies of the scalar fields $Q \propto \dotϕ^2 \dotψ^2$. The scalar field parameters are constrained by using \textit{Planck} 2018 CMB data, DESI BAO measurements, Ly-$α$ forest constraints, and SNeIa observations, and we find that the scalar field parameters are driven toward their $Λ$CDM-like limits; the early dark energy fraction is largely suppressed, and the SFDM mass is bounded to values for which the field behaves close to cold dark matter. In the interacting case, the results show no significant preference for the transfer of energy between dark energy and dark matter at 95\% C.L. In general, the model keeps $H_0$ close to the Planck-$Λ$CDM range and provides best-fit $χ^2$ values comparable to those of the corresponding $Λ$CDM fits.
